The original length of a spring is 12 cm. When a 50g weight is hung on it, the length becomes 15 cm. If the same spring is 21 cm long when a certain weight is hung on it, what is the mass of that weight?
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Worked Solution
Step 1: Calculate extension for 50g = 15cm - 12cm = 3cm.
Step [2-9]: Total extension for the unknown weight = 21cm - 12cm = 9cm.
Step [2-9]: Since 3cm extension = 50g, a 9cm extension = (9 / 3) * 50g = 150g.
Correct answer: 150g
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